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6. HISTORICAL GROUNDWATER LEVELS <br /> The historical groundwater levels have varied from approximately <br /> 5 feet to 7 feet below surface. These levels at the approximate <br /> distances above sea level are identified in Table 3. <br /> A. Gradient Summary <br /> The calculated groundwater gradient data was N220W or 3380 at <br /> 0.004 ft/ft in November 1997, N260W or 3340 at 0.004 ft/ft in <br /> March 1998, N250E or 0250 at 0.05 ft/ft in July 1998, N80W or <br /> 3520 at 0.004 ft/ft in October 1998, N11°W or 3490 at 0.003 ft/ft <br /> in March 1999. <br /> The calculated groundwater gradient is generally northerly at <br /> approximately 0.004 ft/ft. <br /> 7. CONTAMINATION DISTRIBUTION <br /> A. SOIL <br /> 1. VERTICAL DISTRIBUTION <br /> Based on the work reported by SMITH and JPCA, the first five feet <br /> of soil has no detectable hydrocarbon contamination. The <br /> reported hydrocarbon contamination in the soil was detected <br /> between approximately five and twenty feet below surface level. <br /> 2. LATERAL DISTRIBUTION <br /> The area outlined in Figure 5 for soil contamination is <br /> approximately 7, 500 ft2. <br /> The calculated volume of contaminated soil is approximately <br /> 150,000 ft'. <br /> A. WATER <br /> 1. VERTICAL DISTRIBUTION <br /> 8 <br />